be'aspe lujvo

x1 is a daughter-in-law/son-in-law (a spouse of a child of) of x2 according to law/custom x3.

Cf. ti'uspe, spemamta, spepa'u, me'ispe, bunspe, spebe'a, selrirspe, speselrirni.

In notes:

sperirni
x1 is the parent-/mother-/father-in-law (parent of spouse) of x2 according to custom/law x3.